package com.my.oschina.fragment;

import java.util.ArrayList;
import java.util.List;

import android.os.AsyncTask;
import android.os.Bundle;
import android.text.format.DateUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.actionbarsherlock.app.SherlockListFragment;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshBase.Mode;
import com.handmark.pulltorefresh.library.PullToRefreshBase.OnLastItemVisibleListener;
import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener;
import com.handmark.pulltorefresh.library.PullToRefreshListView;
import com.my.oschina.R;
import com.my.oschina.adapter.ListViewNewsAdapter;
import com.my.oschina.app.AppContext;
import com.my.oschina.app.AppException;
import com.my.oschina.bean.News;
import com.my.oschina.bean.NewsList;
import com.my.oschina.common.UIHelper;

/**
 * 资讯-资讯的子类，包括最新资讯
 * 
 * @author XuShaoJie
 * @version 2013-07-05
 */
public class InfoNewsFragment extends SherlockListFragment {

	private int mInstance = -1;

	private PullToRefreshListView mPullRefreshListView;
	private ListViewNewsAdapter mNewsAdapter;
	private List<News> lvNewsDataList = new ArrayList<News>();
	private int lvSumData;// 加载的总数目

	private AppContext appContext;// 全局Context

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		appContext = (AppContext) getSherlockActivity().getApplication();
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		if (savedInstanceState != null) {
			mInstance = savedInstanceState.getInt("mInstance");
		}
		View view = inflater.inflate(R.layout.activity_ptr_list, container,
				false);
		mPullRefreshListView = (PullToRefreshListView) view
				.findViewById(R.id.pull_refresh_list);
		mPullRefreshListView.setMode(Mode.BOTH);
		return view;
	}

	@Override
	public void onActivityCreated(Bundle savedInstanceState) {
		super.onActivityCreated(savedInstanceState);

		// Set a listener to be invoked when the list should be refreshed.
		mPullRefreshListView
				.setOnRefreshListener(new OnRefreshListener<ListView>() {
					@Override
					public void onRefresh(
							PullToRefreshBase<ListView> refreshView) {
						String label = DateUtils.formatDateTime(appContext,
								System.currentTimeMillis(),
								DateUtils.FORMAT_SHOW_TIME
										| DateUtils.FORMAT_SHOW_DATE
										| DateUtils.FORMAT_ABBREV_ALL);

						// Update the LastUpdatedLabel
						refreshView.getLoadingLayoutProxy()
								.setLastUpdatedLabel(label);

						if (mPullRefreshListView.getCurrentMode() == Mode.PULL_FROM_START) {
							lvNewsDataList.clear();
							lvSumData = 0;
							mNewsAdapter.notifyDataSetChanged();
						}

						// 加载数据异步处理任务
						new GetFansTask().execute();
					}
				});

		mPullRefreshListView.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				News news = null;
				// 判断是否是TextView
				if (view instanceof TextView) {
					news = (News) view.getTag();
				} else {
					TextView tv = (TextView) view
							.findViewById(R.id.news_listitem_title);
					news = (News) tv.getTag();
				}
				if (news == null){
					return;
				}
				// 跳转到新闻详情
				UIHelper.showNewsRedirect(view.getContext(), news);
			}
		});

		mNewsAdapter = new ListViewNewsAdapter(getSherlockActivity(),
				lvNewsDataList, R.layout.news_listitem);
		mPullRefreshListView.setAdapter(mNewsAdapter);

		// TODO 第一次启动时候加载数据
		new GetFansTask().execute();

	}

	/**
	 * 加载数据AsyncTask
	 */
	private class GetFansTask extends AsyncTask<String, Void, NewsList> {

		@Override
		protected void onPreExecute() {
			super.onPreExecute();
			getSherlockActivity().setSupportProgressBarIndeterminateVisibility(
					true);
		}

		@Override
		protected NewsList doInBackground(String... params) {
			// 当前pageIndex
			int pageIndex = lvSumData / 20;
			try {
				return appContext.getNewsList(NewsList.CATALOG_ALL, pageIndex,
						true);
			} catch (AppException e) {
				e.printStackTrace();
			}
			return null;
		}

		@Override
		protected void onPostExecute(NewsList result) {
			super.onPostExecute(result);
			getSherlockActivity().setSupportProgressBarIndeterminateVisibility(
					false);
			// Call onRefreshComplete when the list has been refreshed.
			mPullRefreshListView.onRefreshComplete();

			List<News> friendList = result.getNewslist();
			// 加载成功且如果有数据
			if (result != null && friendList.size() > 0) {

				lvSumData += friendList.size();
				lvNewsDataList.addAll(result.getNewslist());
				mNewsAdapter.notifyDataSetChanged();

				if (friendList.size() < 20) {
					mPullRefreshListView.setMode(Mode.PULL_FROM_START);
					// 添加监听器
					mPullRefreshListView
							.setOnLastItemVisibleListener(new OnLastItemVisibleListener() {
								@Override
								public void onLastItemVisible() {
									Toast.makeText(getSherlockActivity(),
											"已加载全部", Toast.LENGTH_SHORT).show();
								}
							});

				} else if (friendList.size() == 20) {
					mPullRefreshListView.setMode(Mode.BOTH);
					// 取消监听
					mPullRefreshListView.setOnLastItemVisibleListener(null);
				}
			}
			// 加载失败或者没有数据
			else {

			}
		}
	}

	@Override
	public void onSaveInstanceState(Bundle outState) {
		super.onSaveInstanceState(outState);
		outState.putInt("mInstance", mInstance);
	}

}
